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By Anil K. Mukherji, R. Belcher and M. Frieser (Auth.)

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Additional info for Analytical Chemistry of Zirconium and Hafnium

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According to Koreman and coworkers,(9) the composition of the oxine precipitate varies with experimental conditions. <10) Zirconium was precipitated first as the phosphate, dissolved in oxalic acid, and the oxinate precipitated from the oxalate solution. The precipitate was finally dissolved in hydrochloric acid and titrated by the bromide-bromate mixture. Verdi-Zade and Elvendov(11) precipitated zirconium as the periodate, filtered, and then dissolved the precipitate and titrated the periodate with thiosulfate.

Ibid. 23, 873 and 1213 (1958). 5. VENKATESWARLU, C. and RAGHAVA R A O , B. S. , / . Indian Chem. Soc. 27, 395 (1950). 6. MOSER, L. , Monatsh. 52, 343 (1929). 7. MOSER, L. , ibid. 48, 673 (1927). 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. MARDEN, J. W. and RICH, M. S. Bur. Mines Bull. N o . 186 (1921). GUMP, J. R. and SHERWOOD, G. , Anal. Chem. 22, 496 (1950). CLASSEN, A. , Rec. Trav. Chim. 62, 172 (1943). , Z . Anal. Chem. 131, 416 (1950). SCHUMB, W. C. and NOLAN, E. , Anal. Chem.

Chem. 26, 77 (1963). 142. MAJUMDAR, A. K. and MUKHERJI, A. , Anal. Chim. Acta, 22, 25 (1960). , and (4) complexometric reactions. NEUTRALIZATION REACTIONS All zirconium and hafnium salts in aqueous solutions hydrolyze slowly to produce hydrogen ions. Consequently, they show a decrease in pH value over a period from 1 to 24 hours. Direct titration of hydrogen ions produced as a result of slow hydrolysis does not give accurate results. Bezier(1) recommends addition of an excess of standard base and boiling the solution.

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